Claims that aliens are already here are everywhere, but proving them is another matter. The strongest cases become more ...

Some people treat the idea of aliens as nonsense, but scientists actually believe that the notion we're alone in the entire universe is alien! The universe is so vast and so unexplored that ...

The Fermi Paradox: Why Haven’t We Found Alien Life in a Vast Universe? Look up at the night sky on a clear evening, and you’re staring at roughly 5,000 stars visible to the naked eye. Now consider ...

John Brandenburg—a plasma physicist at an aerospace development company—argues that there was an alien civilization on Mars. He cites data from NASA’s Curiosity rover, claiming that xenon levels on ...